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Particle
Mass concentrated at single point
Rotational forces and air resistance ignored
Rod (uniform)
Mass symmetrically distributed around centre
No thickness
Rigid
Lamina
Mass distributed across flat surface
Light object
Zero mass
String
Light & inextensible
Acceleration same in two particles connected by taut string
Smooth surface
No friction between surface and any object on it
Rough surface
Objects on it experience frictional force if moving/ acted on
Wire
Rigid
One-dimensional
Pulley
Smooth and light (no mass)
Tension same on either side
Bead
Moves freely along wire/ string
Tension same on either side
Peg
Dimensionless, fixed
Rough/ smooth, as specified
Air resistance
Usually negligible
Gravity (acceleration due to gravity - g = 9.8 ms-2
All objects with mass
Uniform, downwards